Latest Threads |
How to simplify logging?
Forum: Digital Modes
Last Post: VK2CSW
28-04-2024, 02:43 PM
» Replies: 8
» Views: 1,403
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7285kHz AM?
Forum: Off Topic!
Last Post: VK3RX
25-04-2024, 01:16 PM
» Replies: 0
» Views: 218
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VK3XPD 23cm 65W modules
Forum: 1296MHz, Microwave & Opto
Last Post: VK2AZ
22-04-2024, 09:34 PM
» Replies: 1
» Views: 486
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Dud Headphone Jack on Yae...
Forum: Transceivers, Transmitters & Receivers
Last Post: VK2CSW
20-04-2024, 07:53 AM
» Replies: 1
» Views: 686
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23-on-23: Tuesday April 2...
Forum: 1296MHz, Microwave & Opto
Last Post: VK4CZ
19-04-2024, 01:22 PM
» Replies: 0
» Views: 1,068
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Audio Clipping on Sideban...
Forum: LF, HF, MF
Last Post: VK2CSW
17-04-2024, 08:27 PM
» Replies: 3
» Views: 1,464
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FTDX101D & SCU17 ?
Forum: General Discussion
Last Post: VK4TS
16-04-2024, 10:50 AM
» Replies: 1
» Views: 781
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Wiring a microphone for h...
Forum: Homebrew
Last Post: VK2CSW
15-04-2024, 07:47 PM
» Replies: 7
» Views: 3,592
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Dipole for 6m
Forum: 50MHz
Last Post: VK2CSW
15-04-2024, 07:10 PM
» Replies: 6
» Views: 2,675
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Toroid Supplier/s
Forum: Ancillary, Test Equipment, Components & Parts
Last Post: VK2CSW
11-04-2024, 06:26 PM
» Replies: 3
» Views: 1,739
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AREG - Adelaide Radio Experimeters Group - Hamfest Saturday 25th October 2024 |
Posted by: VK3BA - 07-02-2024, 09:25 PM - Forum: Club Activities, Hamfests, Gippstech
- No Replies
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G'day All,
I've heard on the grapevine that the AREG might be holding a Hamfest on Saturday the 25th October this year. I've heard that the club may make announcements later on re the confirmation of this event.
Two things...
- Depending on the interest, I was thinking of booking a table or two to demonstrate & promote some microwave gear & operations. Plus I have to return the favour of Iain VK5ZD of his big effort in coming to the Ballarat Hamvention last weekend with his microwave gear to display and help recruit some newbies.
- Would there be a few microwave operators be interested in heading out to work some microwave bands in the days before and/or after? I was thinking of making a week of it - any excuse to make an escape from lockdown central in VK3.
- I'll have all bands from 2m to 10GHz (inc 3.4G) and maybe by late this year I could have 24GHz ready as well.
Cheers,
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Antenna Tuner Adjustments? |
Posted by: VK4CCV - 05-02-2024, 12:54 PM - Forum: General Discussion
- Replies (2)
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G'Day All,
I have an manual Antenna Tuner (Palstar AT2K), which I am trying to make as efficient as I possibly can with my adjustments.
The manual offered very little help other than providing a suggested settings table, which don't come close to what I have.
I am more concerned about 15-10 Meters.
The antenna is a 132' Half Wave End Fed with a 49:1 Unun at the feed point.
The way I am thinking is to have the Caps as close to fully meshed despite where the inductance sits.
I am assuming this will transfer the maximum amount of energy to the actual antenna.
Thought please.......
Pete VK4CCV
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help wanted - Trio Communications data Transceiver |
Posted by: VK5TRM - 03-02-2024, 06:48 AM - Forum: Transceivers, Transmitters & Receivers
- Replies (2)
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G'Day All,
I am wondering if anyone has some information on the Trio communications data module transceiver. I was going to see if I could use them for A.R. The company was based in Melbourne and closed fairly recently as I believe it was bought out by an international company.
The model number is a TC-450SR and it covers 400 to 520Mhz and has the TC-24SR option fitted
Any info on the modules would be appreciated as I have trawled the net and found nothing. I mainly want the connections on the 15 pin D connector but any other info would be great.
Thanks and Regards
Rob VK5TRM
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Replying to a forum post - everyone please read ! |
Posted by: VK4ADC - 31-01-2024, 06:16 PM - Forum: SYSTEM NOTICES
- Replies (1)
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It seems that some users have forgotten how to properly reply to a post WITHOUT enclosing one - or more - previous posts in their reply.
I often edit out such unnecessary text but it seems timely for a reminder on what to do.. so I don't need to do that.
If you purposefully NEED ( and I stress NEED) to enclose the previous post then use the Reply button (near the Edit / Delete / Quote buttons) enclosed in the bottom segment of the post's screen.
The NORMAL process to initiate a reply uses the separate New Reply button at RHS below that post window.
That allows you to type in your comments without enclosing any previous posts !!
Simple isn't it...
Doug, admin
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Domestic PV solar inverter noise |
Posted by: VK3LU - 31-01-2024, 11:41 AM - Forum: EMC, Interference
- Replies (3)
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Has anyone had any experience with the above rooftop system inverters causing rfi?
I am considering having a new system installed by Solarhart, so any feedback would be very welcome regarding their inverters.
Nev
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WSJT modes that do not work on EME |
Posted by: VK5PJ - 26-01-2024, 01:02 PM - Forum: Digital Modes
- No Replies
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Recently on the WSJT-X developer mail list a query was sent about why Q65 15 second mode does not work on EME. It started with this report from Dwayne, AB6A in which he asks about why Q65 15A does not work on EME. Joe goes on to explain that none of the 15 second period modes will work on EME and more importantly WHY they should not be used for EME.
I found this to be a very clear description of WHY things like FT8 and Q65-15 cannot be used on EME, I hope it helps others understand why the use of FT8 for EME is just a silly idea.
Dwayne Sinclair wrote:
There have been ongoing reports from various operators best summarized in the post attached that Q65-15A is “broken”. What is current consensus on this and if it is broken, is there any plans to address the issues?
Q65-15A Part II Testing and Sensitivity Bob Atkins - KA1GT Q65-30A test results
Regards Dwayne AB6A
Joe Taylor wrote:
Hi Dwayne,
Thanks for the QSO with W2ZQ, last evening.
Who is saying Q65-15A is broken, and why?
Are you (or they?) talking about EME? If so, are you aware that the Q65-15x sub-modes are not supposed to work for EME. The 2.5 s EME delay is too large.
-- 73, Joe, K1JT
Dwayne Sinclair wrote:
Thanks Joe for QSO and the confirmation that Q65-15A is not to be used for EME. Our “bad” in that in our circles we may have been referring to it as broken.
The attached article details some of the testing that has occurred to date in an attempt to work with what we have.
I guess the EME community (including me) are looking for a faster QSO where conditions and equipment support it?
Regards Dwayne AB6A
Joe Taylor wrote:
Hi Dwayne,
I discussed these issues at some length with Bob, KA1GT, some 1.5 years ago. Here are the relevant details.
Sure, we could make a version of Q65-15A that can decode after normal EME delays. It would not be a very good fit for the channel, however.
This is because the duration of a Q65 transmission is 12.8 s, and the transmission starts at t = 0.5 s into the 15-second sequence. Add a 2.7s EME delay, and you're already 1 second into the next sequence -- even without any clock errors.
You could make the Tx duration smaller, say 10 s. Then, if the transmission starts at t=0.5 s and there's a 2.7 s EME delay, reception would be complete at t=10.5 + 2.7 = 13.2 s, and (if clocks were spot on) the decoder would have 1.8 s to do its thing.
Even this is not really enough, because clocks are not always "spot on". Moreover, you would lose an additional
10*log(12.8/10.0) = 1 dB of sensitivity. WSJT modes do a lot to gain every 0.1 dB of sensitivity, so we certainly don't want to to that!
Fifteen-second sequences are not an efficient choice for a path with delays as large as 2.7 s. If there were many times more EME activity than at present, so that very fast QSOs were desirable in contests, and if nearly everybody had many dB's to spare on the EME path, something like Q65-15A might be desirable.
As things stand, our advice is to use Q65-30B for EME on 1296 MHz.
-- 73, Joe, K1JT
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Update #1 134GHz project progress |
Posted by: VK2XAX - 24-01-2024, 12:44 PM - Forum: 1296MHz, Microwave & Opto
- No Replies
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Hi all,
I've finally completed the BoM for manufacture of the 134GHz VK3CV boards, if you are interest in acquiring the parts for a 134GHz transverter please join our mailing list here...
https://groups.io/g/The122GProject
All documentation & information on this project is in our wiki here...
https://groups.io/g/The122GProject/wiki
Also let anyone else know who might be interested to get on board ASAP.
I intend to place the 1st RFQ in the next few weeks.
I'm also finalising the engineering diagram for manufacture of the IMU horn, once that's complete I'll be asking for quotes on that and all the other antenna parts.
I hope to have indicative pricing within the next few weeks.
thanks
Tim
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CW on 6M |
Posted by: VK1PWE - 08-01-2024, 05:24 PM - Forum: 50MHz
- Replies (4)
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Hi all, not that there has been much propagation in VK1, but is there an agreed calling freq for CW on 6M within VK and/or international? I've looked, but I can't find one definitive freq for this purpose.
My preference is not to use .110, but happy for advice.
Tks,
Scott
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New 10m repeater VK3RBA |
Posted by: VK3BA - 05-01-2024, 09:39 PM - Forum: LF, HF, MF
- No Replies
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G'day All,
FYI, a new 10 metre repeater has been installed at VK3RBA Mt Buninyong near Ballarat.
It's currently a parrot repeater (with a 55sec TOT) until the licence comes through, then it'll be re-configured as a full repeater.
Repeater TX: 29.670MHz
Repeater RX: 29.570MHz
CTCSS: 123.0Hz
Built by Tim VK3TIM and site sponsored by Amateur Radio Victoria.
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